Linked by Thom Holwerda on Sun 7th Aug 2005 12:25 UTC, submitted by Valerie
Microsoft's current plan for OpenGL on Windows Vista is to layer OpenGL over Direct3D in order to use OpenGL with a composited desktop to obtain the Aeroglass experience. This means that OpenGL performance will be significantly reduced - perhaps as much as 50%. It would be technically straightforward to provide an OpenGL ICD within the full Aeroglass experience without compromising the stability or the security of the operating system. Layering OpenGL over Direct3D is a policy more than a technical decision.
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If you have ever tried out an OpenGL over Direct3D application you know that it is extremely slow in comparison to real OpenGL. It seems like Microsoft just came up with another reason you don't want to use Vista. Thank God Linux uses OpenGL and NVIDIA and ATI are providing fast drivers.